Video game crossovers are becoming more and more commonplace these days. It's an easy way to raise the profile of both franchises while giving shared fans something to enjoy. Plenty of games mash together characters, stories, or elements of two IPs, whether it's as brief as a cameo or as in-depth as an entire fictional world.
Source：https://www.cbr.com/coolest-crossover-dlcs-in-video-games/
